Adjusting means



A" PETELER Feb. 17, 1931.

ADJUSTING MEANS Filed Sept. 25, 1922 EEnEuEEEEm w 11v VENTOR I BY Mi -Q ATTORNEY Patented Feb. 17, 1931 rr E PATENT OFFICE ADOLPH PETELER, F FREEPORT, NEW YORK, ASSIGNOR T0 THOMAS HOWE, 01 WHITE PLAINS, NEW YORK ADJUSTING MEANS Application filed September 25, 1922. Serial No. 590,275.

This invention relates to indicating means for use in the adjustment of radio apparatus such as variometers, condensers etc. but it may have other uses.

The subject matter of this case is an improvement upon the device of my application Ser. No. 567,858 filed June 12, 1922.

Radio receiving sets are usually placed in a cabinet, and upon a suitable panel are mounted, among other things, dials or scales for indicating the portions of the adjusted parts.

It is usual in radio apparatus to either directly connect the adjusting handle with the part to be adjustedand to directly connect the indicating dial with the said handle, and movements of the dial corresponding to movements of the adjusted parts which cause considerable change in the operation of the apparatus are very small. This renders it difficult to observe niceties of adjustment of the apparatus so that the operation frequently sufiers accordingly.

It is the main object of the present invention to simplify the movement of the indicating means with relation to the adjustment movement of the apparatus being adjusted that variations in adjustment may be accurately observed and the apparatus set with greater nicety.

It is a further object of the invention to provide a series of gears which operate substantially without any lost motion thereby enabling very accurate adjusting of the indicating means.

Further and ancillary objects of the invention will appear hereinafter.

In the accompanying drawings which illustrate the invention- Figure 1 is a front elevation of the improved indicating means witha portion of the panel on which it is mounted, the remainder of the panel being broken away;

Fig. 2 is a section on the line 22 of Figure 1;

Fig. 3 is a section on the line 33 of Figure 2; I

Fig. 4 is a rear View of the adjusting apparatus viewed from the back Where it fits against the panel.

Referring to the drawings the rotatable spindle or shaft 1 extending through the panel 2, is secured to the adjustable coil of a variometer 3 of a radio receiving set. The adjusting handle as ordinarily constructed, would be mounted onthe end of the shaft 1, and consequently when it is desired to use the present invention a standard form of construction may be taken and the ordinary handle removed and the improved one applied by securing it to the face of the board and to the end of the shaft 1 in place of the ordinary handle.

The improved adjusting and indicating means comprises a toothedmetal gear 4, which is secured to rotate with a member 5. The member 5 is attached to the shaft or spindle 1 by a counter-sunk screw 6 and adapted to rotate therewith. A rubber facing 7 surrounds the member 5. Also rotatably mounted in the housing 8 is a shaft 9, which carries the metal toothed gear 10 at the inner end, and a gear 11 adjacent thereto. The gear 10 meshes with the gear 5. The gear 11 engages the rubber face 7 and drives the same by frictional engagement. The gear 11 may be fluted, knurled or otherwise roughened, and may indent the rubber surface, to produce a better driving engagement. The driving ratio of the members 5 and 11 is the same as that of the gears 4 and 10.

The back of the housing 8 is closed by a cover plate 12 secured thereto by screws as 13. A recess 14 is provided in the cover plate, into which a lug 15 of the housing 8 extends, thereby holding the cover plate in proper relation to the housing.

The ratio between the gears 5 and 10 is 2 to 1 so that for a unit of angular movement of the variometer coil, the dial 9 will move through twice that angle. Inasmuch, therefore, as the usual dial is graduated over only one-half of its circumference, since the dial in the present case moves twice as far for a given movement of the variometer, the graduations must be extended around the entire circumference, and the scale is amplified or made larger so that it may be more readily observed and n cer a j stments efiected.

The rubber face 7 and its cooperating member 11 eliminate lost motion in the adjustment of the indicator. It has been observed that in the use of metallic toothed or cut gears alone, such as gears 5 and 10, a certain amount of play exists, and although it is but slight, yet in proper adjustment but a fraction of an inch will be detrimental to the proper functioning of the apparatus, the drive between the shafts afforded by the engagement of the face 7 and the member 11 is without back lash or lost motion while the toothed gears 5 and 10 prevent any disadjustment which might otherwise be occasioned by slipping at the face 7.

A cone-shaped handle 1% readily permits turning of the petticoat 15. The petticoat 15 is graduated as shown. t will thus be seen that by rotating the handle 14 the shaft 9 to which it is secured may be rotated.

A stop pin 18 on the gear 4 limits the movement coming against the edges of the plate 12.

lVhile the invention has been illustrated in what is considered its best application it may have other embodiments without departing from its spirit and is not therefore limited to the structure shown in the drawings.

hat I claim is:

1. In an indicating attachment, the com bination with a shaft rotatably mounted in a housing said shaft adapted to operate the part to be adjusted, of a second rotatable shaft, gearing between said shafts, a cover plate for said housing forming a bearing for said shafts and provided with a notch, a lug on said housing adapted to register with said notch, whereby said cover plate is held in proper position.

2. In an indicating attachment, the combination with a housing, of a plurality of gears mounted therein, at least one of said gears having a flexible face, an adjusting shaft rotatably mounted in said housing to which some of said gears are secured, a second shaft connected with some of said gears, an indicator secured to said last mentioned shaft and a cover plate for said housing provided with a notch registering with a lug on said housing.

In testimony whereof I have signed this specification this 8 rd day of September,

ADOLPH PETELER. 

